SCIENTIFIC AND TECHNOLOGICAL ACHIEVEMENTS OF RESEARCH INSTITUTE FOR AQUACULTURE No

Study on effect of salinity and stocking density on 21 day-old Snubnose pompano (Trachinotus blochii Lacepède, 1801) was conducted in three experiments. Experiment 1: Fish were stocked at different salinity levels at 10, 15, 20, 25, 30 and 35‰ in 48 hours; experiment 2: Fish were stocked at different salinity levels at 10, 15, 20, 25, 30 and 35‰ in 28 days; and experiment 3: Fish were stocked at three different densities of 1.0 fish per liter, 1.5 fish per liter and 2.0 fish per liter in 28 days. The results indicate that Snubnose pompano were not affected by different salinity conditions, as the survival rate of fish after 48 hours varied from 97.67±0.58% to 99.67±0.76%, but with no significant difference among the treatments (P>0.05). The experiment on rearing fish in different salinity levels showed that at salinity range from 20 to 25‰ provided the best conditions for growth as they grew, significantly faster than the fish reared at salinities of 10, 15, 30 and 35‰ (P<0.05). Fish reared at stocking density of 1.0-fish/l had the highest growth rate (1.69±0.14 g), which was significantly different from those fish reared at stocking densities of 2.0-fish/l (1.23±0.03 g) There were no difference from those fish reared at 1.5fish/l (1.49±0.09 g). Survival rate of fish after 28 days was not affected by salinity and stocking density in the above experiments. Thus, the results of the experiments indicated that the range of salinity between 20 and 25‰ and stocking density of 1.5-fish/l most suitable for rearing Snubnose pompano in hatcheries for rearing of the juvenile Snubnose pompano.